The BX-1550 is a passive 15-inch subwoofer for low-frequency reinforcement in stage, mobile DJ, club, and dance-school applications. Its vented bass-reflex enclosure contains one 15-inch woofer and provides 400 W RMS power handling, 800 W program power, an 8-ohm impedance, and a 20 to 300 Hz frequency range. It includes a switchable passive crossover, 35 mm flange, two carrying handles, steel protective corners, and a black metal grille.